Theorem or12 523

Description: Swap two disjuncts. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 14-Nov-2012.)

Assertion

Ref	Expression
or12

Proof of Theorem or12

Step	Hyp	Ref	Expression
1		pm1.5 522	. 2
2		pm1.5 522	. 2
3	1, 2	impbii 188	1

Syntax hints:  <->wb 184  \/wo 368

This theorem is referenced by:  orass  524  or32  527  or4  528  3orcoma  981  sotrieq  4832  ordzsl  6680  plydivex  22693  socnv  29194

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem depends on definitions:  df-bi 185  df-or 370